Retrieve master instance AMI ID from parameter.

Windows AMI provided by amazon is not sustinable, because it is
unregistered when the new version is released.
So the AMI-ID of windows instance cannot be written within the template.
support spot instances for slaves.
add parameters to properties file.
Merge branch 'feature/support_spot_instances' into develop
set version label to 1.1
Merge branch 'release/1.1' into develop